Nitrogen balance in barrows fed low-protein diets supplemented with essential amino acids uri icon

abstract

  • This study was conducted to determine the effect of addition of essential amino acids (EAA) to low-protein diets on N balance in barrows. Thirty barrows (Duroc Yorkshire) with an initial BW of 36kg were fed 5 corn- and soybean meal-based diets containing 13.6 to 18.2% crude protein (CP) for 10d in a randomized complete block design. The 18.2% CP diet was formulated without addition of EAA (Lys, Met or Thr). The other diets contained 13.6 to 16.5% CP and were supplemented with EAA to provide 0.83% true digestible lysine equal to that in the 18.2% CP diet. Fecal, urinary, and total N excretion as well as N retention (g/d) decreased with decreasing dietary CP level (P < 0.01). The apparent digestibility of N was almost the same for the 18.2 and 16.5 CP diets, but the value was 2% higher (P = 0.07) than that for the 13.6% CP diet. These findings indicate that, compared with the 18.2% CP diets, supplementation with three EAA to the lowest-protein diets (13.6 CP) is inadequate for maximum intestinal protein digestion, amino acid absorption, or tissue protein deposition in growing barrows. 2007 Elsevier B.V. All rights reserved.

published proceedings

  • LIVESTOCK SCIENCE

author list (cited authors)

  • Deng, D., Huang, R. L., Li, T. J., Wu, G. Y., Xie, M. Y., Tang, Z. R., ... Yin, Y.

citation count

  • 36

complete list of authors

  • Deng, D||Huang, RL||Li, TJ||Wu, GY||Xie, MY||Tang, ZR||Kang, P||Zhang, YM||Fan, MZ||Kong, XF||Ruan, Z||Xiong, H||Deng, ZY||Yin, Y-L

publication date

  • May 2007